使用来自 SQL UPDATE 查询的多个数据

Question

我正在使用下面的查询将数据写入临时 table。为此，我使用更新命令。但是，有时 table 中的值可能不止一个，在这种情况下，我的更新查询 select 是第一个值。当多个值出现时，我如何让他select最大的？我使用了 MAX 命令和 CROSS JOIN 方法，但我得到了错误的值。 personel_giriscikis table

declare @kartno nvarchar(50);
declare @ilktarih datetime;
declare @sontarih datetime;
declare @devamsizliktablo TABLE(
Tarih datetime,
Giris time,
Cikis time,
Gun nvarchar(50),
Durumu nvarchar(50),
Hesap float,
Vardiya nvarchar(50),
Vardiyagsaat time,
Vardiyacsaat time,
Gecgelme float,
Erkencikma float)

UPDATE @devamsizliktablo SET Giris=p.cikis_saat 
FROM dbo.personel_giriscikis AS p 
LEFT OUTER JOIN dbo.personel_kartlari AS pk ON pk.id=p.personel_id 
LEFT OUTER JOIN dbo.Takvim AS t ON t.tarih=p.tarih
LEFT OUTER JOIN @devamsizliktablo AS d ON d.Tarih=p.tarih
WHERE p.tarih>=@ilktarih AND p.tarih<=@sontarih AND pk.kartno=@kartno AND d.Tarih=p.tarih

Answer 1

首先，你不需要使用LEFT JOIN。您可以使用 GROUP BY 找到最大值，然后进行更新：

;WITH cte_max(Tarih,cikis_saat)
AS
(
  SELECT d.Tarih, MAX(p.cikis_saat) AS cikis_saat
  FROM dbo.personel_giriscikis AS p 
  INNER JOIN dbo.personel_kartlari AS pk ON pk.id=p.personel_id 
  INNER JOIN dbo.Takvim AS t ON t.tarih=p.tarih
  INNER JOIN @devamsizliktablo AS d ON d.Tarih=p.tarih
  WHERE p.tarih>=@ilktarih AND p.tarih<=@sontarih AND pk.kartno=@kartno
  GROUP BY d.Tarih 
)
UPDATE d
SET d.Giris=m.cikis_saat 
FROM @devamsizliktablo d
INNER JOIN cte_max m
ON m.Tarih=d.Tarih;

使用来自 SQL UPDATE 查询的多个数据

Using multiple data from a SQL UPDATE query

sql-server

multiple-value

user-defined-functions

multiple-columns

sql-update